Try OCaml [In-Browser repl with interactive lessons]

[Bruno Deferrari]

http://try.ocamlpro.com/

Very interesting, and a good way to learn the basics and get the feel
of the language. Maybe Shen can have something like this once the
Javascript target is ready.

--
BD

[WILLI Riha]

More info is needed! I don't know anything about Ocaml.

 

I type

 1

and get

1;;

 

I type

1 + 2

and get

1 + 2;;

 

I type

arse

and get

unbound variable arse

 

I type

12345678910

and I am told the integer is too large.

 

I have a sip of wine

and get no response

 

I am intrigued - how does one use this language?

Thanks

 

Willi

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[4DA]

Nice!

They've got ocaml implemented on top of JS VM?

[Bruno Deferrari]

Hey Willi. The results are on the second line, what you mentioned is
the auto-correction you get from your inputs.

# 1;;
- : int = 1
# 1 + 2;;
- : int = 3
# arse;;
Characters 0-4:
Error: Unbound value arse
# let arse = 1;;
val arse : int = 1
# arse + arse;;
- : int = 2

The reason 12345678910 doesn't work is that OCaml numbers aren't
arbitrary precision (those are part of the standard library, but
"normal" numbers are limited)

To start the with the lessons type: lesson 1.

But don't worry about OCaml!! it was the in-browser REPL that I wanted
to show. Here are more examples of the same concept:

http://tryruby.org/
http://tryhaskell.org/
http://tryclj.com/
http://tryarc.org/
http://www.tryerlang.org/
http://tryjavascript.devfu.com/
http://www.trypython.org/ (this one requires silverlight)

What is interesting about the OCaml one is that what you see there is
the same REPL you get when running OCaml locally, but this one runs
completely in-browser. It was compiled with js_of_ocaml[1], which is a
tool that compiles OCaml bytecode to Javascript, and seems to work
pretty well. Because Shen will target Javascript too, the same should
be doable.

Others just launch a REPL on the server and interact with it,
something that doesn't convince me (because of security issues, and
because it needs more resources).

[1] http://ocsigen.org/js_of_ocaml/

--
BD

[Bruno Deferrari]

On Tue, Dec 27, 2011 at 9:59 AM, 4DA <dcher...@gmail.com> wrote:
> Nice!
>
> They've got ocaml implemented on top of JS VM?
>

They use this tool: http://ocsigen.org/js_of_ocaml/

It compiles bytecode generated by the OCaml compiler (the one that
doesn't generate native code) to Javascript.

--
BD

[eigenfunction]

works for me ;-)

# 12345678910.0;;
- : float = 12345678910.

Willi, if you do not like the semi-colons, may be you take a look at
F#. Those are the languages that Shen
will be fighting against in the first place.

[Bruno Deferrari]

On Tue, Dec 27, 2011 at 10:54 AM, eigenfunction <emeka...@yahoo.com> wrote:
> works for me ;-)
>
> # 12345678910.0;;
> - : float = 12345678910.
>

Oh, but thats a float. You can't do the same with integers unless you
are using the Num module.

http://caml.inria.fr/pub/docs/manual-ocaml/libref/Num.html

--
BD

[WILLI Riha]

Thanks for all your replies!

 

W

--
BD